arp -a [Displays current ARP entries by interrogating the current protocol data.]

>arp /?

Displays and modifies the IP-to-Physical address translation tables used by
address resolution protocol (ARP).

ARP -s inet_addr eth_addr [if_addr]
ARP -d inet_addr [if_addr]
ARP -a [inet_addr] [-N if_addr] [-v]

-a            Displays current ARP entries by interrogating the current
protocol data.  If inet_addr is specified, the IP and Physical
addresses for only the specified computer are displayed.  If
more than one network interface uses ARP, entries for each ARP
table are displayed.
-g            Same as -a.
-v            Displays current ARP entries in verbose mode.  All invalid
entries and entries on the loop-back interface will be shown.
inet_addr     Specifies an internet address.
-N if_addr    Displays the ARP entries for the network interface specified
by if_addr.
-d            Deletes the host specified by inet_addr. inet_addr may be
wildcarded with * to delete all hosts.
-s            Adds the host and associates the Internet address inet_addr
with the Physical address eth_addr.  The Physical address is
given as 6 hexadecimal bytes separated by hyphens. The entry
is permanent.
eth_addr      Specifies a physical address.
if_addr       If present, this specifies the Internet address of the
interface whose address translation table should be modified.
If not present, the first applicable interface will be used.
> arp -s   00-aa-00-62-c6-09  …. Adds a static entry.
> arp -a                                    …. Displays the arp table.


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